class_docstr: Begin(state_name) is a Plex action which causes the Scanner to
  enter the state |state_name|. See the docstring of Plex.Lexicon
  for more information.
code: def __repr__(self):
      return "Begin(%s)" % self.state_name
  
label_desc: Use image node_id 3 for calling the Begin obj's underlying member method code with example usage: obj.__repr__() and returns: unknown